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| EFFECTS OF SURFACE CONDITION ON CORROSION AND STRESS CORROSION CRACKING OF ALLOY 690TT |
| ZHANG Zhiming, WANG Jianqiu,HAN En-Hou, KE Wei |
| State Key laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Abstract The scanning electron microscopy (SEM), atomic force microscopy (AFM) and surface profilometry were employed to characterize the surface conditions of Alloy 690TT samples. The corrosion behaviors of Alloy 690TT samples with different surface conditions were compared by potential of zero charge (PZC), potentiodynamic polarization curves and electrochemical fast and slow scan. The experiment results showed that the surfaces ground to 400# were much rougher than the mechanically polished surfaces and surface roughness of the former was bigger than the latter. The corrosion rate of the ground surfaces was bigger and the ground surfaces were more sensitive to stress corrosion cracking (SCC), compared with the mechanically polished surfaces in the same corrosive environment. That corrosion of Alloy 690TT could be accelerated by single surface roughness or single surface residual strain. The difference of corrosion rate and the sensitivity of SCC in this experiment were affected by surface roughness and surface residual strain simultaneously.
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Received: 23 August 2010
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Corresponding Authors:
WANG Jianqiu
E-mail: wangjianqiu@imr.ac.cn
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